Assighxxb to the sebastian lathe



June 24, 1930. w, SCHRODER 1,768,495

MACHINE TOOL STOP MECHANISM Fiied March 5, 1926 3 Sheets-Sheet 1 (W, N"H mm Jamey,

June 24, 1930. w; SCHRODER 1,768,495-

MACHINE TOOL STOP MECHANISM Filed March 1926 5 Sheets-Shae: 2

June 24, 1930. w. SCHRODER MACHINE TOOL STOP MECHANISM Filed March a,1926 s Sheets-Sheet 3 Patented June 24, 1930 v UNITED STATE WILLIAMsonnonnn, or covmeron, KENTUCKY, ASSIGNOR TO THE SEBASTIANLATHE COMPANY}OF CINCINNATI, OHIO, A CORPORATION O1" OHIO MACHINE-TOOL-STOP MECHANISMApplication filedMarch 3, 1926. Serial'No. 92,082.

.My invention relates to improvements in stopmechanism for lathes andother machine tools. One of its objects is to provide improved toolcarriage, cross-feedstop 5 mechanism. Another object is to provideimproved tool carriage longitudinal feed stop mechanism. Another objectisto provide improved stop feed mechanism whereby a series of work, orstock, members may be successively dressed at different sections toduplicate dimensions, and whereby the shoulders separating such stockmember .sections may be accurately dressed and spaced to uniformdimensions. Another object isto provide improved longitudinal stop feedmechanism adapted to be set for relatively short as well as longspacing. Another object is to provideimproved stop feed mechanismadaptedto stop a tool carriage provided with a pluralityof tools toindependently positionthe respective toolsas to their cross-feed.Another object is to provide stop feed mechanism adapted to stop a coolcarriage provided with a plurality of tools to .25 independentlyposition the respective tools as to their longitudinal feed. Another-ob-. ject is to provide improved stop feed mechanism adapted to stopatool carriage providedwith' a plurality of tools to independentlyposition the respective tools as to their cross-feed, and also .as totheir longitudinal feed. My 'inventionalso comprises certain details ofform and arrangement, and combination of components 'all'of which willbe 5 fully set forthin the description of themcompanying drawings inwhich: 4 Fig. 1 is a front elevation of a portion of a lathe embodyingmy improved stop mechanism. r 1 1 Fig. 2 is afplan of the same.

cross-feed stop disks detached.

Fig. 3 is a detail partly in side elevator and r Fig. 7 is a perspectiveview of a portion of the lathe bed tool-carriage and longitudinal stopmechanism shown in Figs. 1 and'2.

Fig. 8 is a perspective view of a pair of' the longitudinal stop barsdetached; and

illustrating a modification of the stop bar 7 shown in Figs. 1,2 and 7.I 1

Fig. 9 is a sectional detail through a portion of the longitudinal stopmechanism shown in Fig.7.

Fig. 10 is aperspective view of one of the cross-feed" stop barsdetached. V

Fig. 11 is a perspective view of one of the cross-feed stop baradjusting members detached. I

Fig. 12 is a View similar to Fig. 4 innstrating a modification. v

Fig. 13 is a detail partly in ing a modification; v

I The accompanying drawings illustrate the preferred embodiments of myinvention in which 1.5 representsthe lath-e ways or lathe bed; 16 thelathe headstock, and 17 the tailstock and 18 the chuck. A main toolcarriage 19 is mounted upon the lathe ways intermediate of thehead-stock and tail-stock, and is adapted to be fed longitudinally ofthe ways 15,.either by hand feed or by power feed in the customarymanner. A clamping bolt 20 and nut 21 enable the tool carriage to berigidly clamped to the lathe ways when desired; A slide or cross feedtool carriage,

section showthe main tool carriage to travel transversely of the latheways upon and relative to the main tool carriage. A crossfeed screw 25is journaled in a sleeve 26 rigidly mounted upon themain tool carriage.The cross feed screw is preferably adapted to be optionally driven byhand or by power in either direc tion in customary manner. The screw 25engages a nut attached to the cross-feedtool I carriage by meansof whichthe cross-feed ed upon the cross-feed tool carriage, de sired, but Ipreferably provide a second tool 29, and tool holder 30 therefor, alsodetachin position upon the sleeve 26, as for instance 7 by means of aset screw 33, and lock nut 34. The collar 32 has a channel 35 in whichare mounted a pair of stop'pawls 36 and 37. The pawls 36 and 37 arepivotally mounted upon a pin 38 relative to the collar 32, and have eacha limitedrocking movement independently of the other, whereby one orother of said pawls may be shifted from the active or operative positionto an idle or imperative position. Springs. 39 and 40 seated in recessesin the sleeve 32 bear yieldingly upon the rear ends of the pawls 36 and37 respectively, tending to hold said pawls yieldingly in operativeposition. A pair of rock shafts 41 and 42, see Fig. 11, each providedwith an eccentric portion of reduced cross section 43 9 having aflattened portion 44, and shoulders 45 and 46 between which therespective pawls 36 and 37 engage, are mounted end to end in a recess 47in the sleeve 32. Each of the rock-shafts 41 and 42 is provided with anactuating lever 49 by means of which it may be rocked nearly one half ofa revolution. At

one extreme of the rocking movement of the members 41 and 42, theeccentric portion thereof is out of engagement with the under face ofits adjacent pawl 36 or 37, while at the opposite extreme of saidrocking movement the eccentric portion 43 serves to liftthe pawl 36 or37- out of its operative position into an idle position and at the sametime the flattened section 44 engages the under face of the pawl 36 or37 to retain the locking member and pawl locked in idle position untilthe rocking member is manually operated to release the pawl from itsidle position.

The cross-feed screw 25 is locked to its sleeve 26 against movementendwise relative to said sleeve by meansof a collar 48 seated in arecess in the end of the sleeve 26 and locked to rotate with thecross-feed screw, by means of a short key 49. A lock-nut50 is threadedto the crossfeed screw outside of the collar 48, being adapted to beadjusted thereon by means of a spanner wrench enteringrecesses in theouter face of the nut 50. Outside of the nut 50 is a cylindrical sectionof the cross-feed screw upon which are mounted preferably two disks orcollars 51 and 52 which are respectively provided with a pluralityofstop slots or recesses 53, and 54,

said stop recesses 53 on the collar 51, being faced in the oppositedirection to the recesses 54 on the collar 52. When the collars 51 and52 are originally placed upon the end of the cross-feed screw they areadjusted rotatably thereon by hand until the respective recesses '53 and54 are in the desired position with reference to the cross-feed screw tostop the cross-feed of the respective tools at the desired positionswhen said recesses 53 and 54 are respectively or alternately engaged bythe pawl tooth 55 of the pawl 36 or by the pawl tooth 56 of the pawl 37,depending upon which pawl 36 or 37 is adjusted to operative position.After the collars 51 and 52 have been originally adjusted to positionupon the end of the cross-feed screw they are temporarily held in placeby means of set screws 57 which in turn engage soft metal plugs 58,which engage the face of the end of the cross-feedscrew without dangerof injuring the same. After the collars 51 and 52 have been adjusted byhand to correct position, they are firmly and reliably clamped together,and to the end of the cross-feed screw by means of a nut 59 threaded tothe end of the cross-feed screw outside of the collars 51 and 52.

A hand wheel 60 is slipped loosely and detachably upon the end of thecross-feed screw outside of-the nut 59, and is keyed to the cross-feedscrew to enable the cross-feed screw to be actuated manually, which isthe usual practice. If desired however,the crossfeed screw may beprovided with a gear and be driven thereby by power from a train of.

gears in the tool carriage apron, in a customary manner of driving thecross-feed screw.

One of the collars, for instance the collar 52 is provided with a seriesof stop recesses 54 to be successivelyengaged by the tooth 55 of thepawl 36 to enable the tool 27 to be successively set accurately topredetermined positions in order to cut the work therewith topredetermined depths at different sections of its length. The othercollar, for instance collar 51, by means of the series of stop recesses53 to be successively engaged by the tooth 56 of the pawl 37, providesfor successively adjusting and setting the tool 29 accuratelytopredetermined positions in order to cut the work therewith topredetermined depths at different sections of its length. A large numberof duplicate work members may thus be machined, one after anotheraccurately to uniform diameters using one set of collars 51 and 52. Therespective collars 51 and 52 are readily detachable and replacable withother similar collars in sets, but provided with differently spaced stoprecesses. The relative cross-feed movements of the tools upon the toolcarriage as compared with the movements of the periphery of the collars51 and 52 bemes es neath the pawl teeth andbt' is very small, forinstance, somet ing like one thousandth f inch f tool mo,vemen to eac 1on onrth of a inohmotement of the periphry of the collars 1 and sarcasm.to ime of the Projections orte th 5.5 and 1565 the eby providing oraccpracy in the dimeIlSiO Si f s cc ssive work members The c osseed crewmay e sever l ie o iit siris etw en successi e engagements of the pawl.

6. or: 3 ith successive stop recessesot a olla .51 or 52- a Inorder thatthe sho lders 661% 65, 66 nd 6,7 of respe t e or succ ssiv w rk piecesmay e accurate y spaced at. pre eterm ned is ances apart, .1 pro ide sop mechanism adapted to be employed to stop the 1011 151.- ndinal feedof the to learr age'. succes ive y r ea h work piec predetermined posi-wtions- This longit dinal stop; mec anism comprises a supporting bar 68attached to ne end o the ool arriage 19 nd m yab e herew th long thelathe bed- The free nd o the b r 8 passes hroughja re e 69. in a block ocarriage 70 whi h is mo ed to move endwise along the lathe bed, and is.dapt to e rigidly clamped t the lathe e y m ans of clamping bol s 2. he

recess 69 serves to uppor gnidethe ee en of the bar 68- The barf 8 has ang u nal rece s 73 hich .serv'es ohably a in e changeably recei e and poa r e of stop bars In F g,- 7 I h e t ed th use o a singl stop bar While'1 and 8. .1 hav illustrated s op bars '75 an 7 arranged id by d an daptd to be jointly emp oyeilinterchangeably hthe b r Yf A separate stop baror set of stop bars designed to be employed for each type of work memberto b ned out in duplicate The st p ars 74;, 75 and 76 are eachprovidedon their o e edg wi h a otch or recess'77 o engage over a crossbolt 78 Which spans the recess in the bar 65 in which the stop bars ea thold he s op bars longitudinally in p e .A tch ba 50 is pi otal y att ce to on d face of the carriage 7O at8l, and at its free end is providedwith a hand lever 82. A coiled spring seated-upon a pro- "i on 8 t hdi gf o th carriage 7 g ge th under fa of the latch ar 80 to al y hold aidlatc bar in an elevate or inoperative position; slideor carriage ismounted upon the latch bar 80 to have a limitedv sliding movementfindwisfi ofvthe is or th latch bar 'O,'to e ableone end,

stop mechanism, is as' follows.

of the t th 87 to e gage any on of h notches 9 of the s op ba 7 nd theopp ite end of the ooth 87 to ng ge anyone of h notches 90 of the op bar76, Wh re V he sh uld rs 64:, 6.5., 66 and 67 of the work membe s] respa ed considera le dist nces apart, a single bar 74 with n ches 8 ac os en i e face is adap ed to be employed fliers however the spacesbetween the shoul ersbe, 6 5, 66 and67 of the work a e elai e1y.shor,,-I prefe a y emp oy a plurality of bars 7 5 and 7b ahdadjust the slide85 upon; he latch bar 80 to e able opposite e dsof he, too h 87 to slecti ely e g ge e n t e 9 and 90a and th reby spa e o k. membershouldersclose together. In order that the l tch ar may be i ted ut ofengage en with the spaci g ars 7 7 5., -6 and 7 7 m a position of theoperator in front of the tool arr ag I pro id a spl ne-d sha a edandijon nal a on end. tothe end o the tool carriage a d prov ded with ahand lev 92'by'1neahs of which said shaft 91 may he rocked, The free endof shaft91 is mounted in and keyed to a sleeve 93 which is journaledvto-the carriage 70. The sleeve 931s provided with a crank arm 94connected by a linkwith the latch bar 80 to lift the latch bar, see

Fig. 7 and thereby disengage the tooth 87 fromengagemcnt with any one ofthe notches 8,8, 89 and 90,.

g- 2 I h ve illustrated a mod fication I in whi h in addi on o t m mberssho n in F igsB and I ave shown wo co lars 8 nd .99 each p ovid d ith ascale 101 and 2adapted to be adjnstedwith refere ce to apointer 103 uponthe sleeve 32. Where the niimher of duplicate work members to be provded is too small to j sti y e pe ially preparing a set of collars 51"and52 with properly spaced recesses 53 and .54, the scales 101 and 102enable the feed screw 25 to be re?- peat edly turned to predeterminedpositions. The use Of the Collars '98 and 99 in conjunction with thecollars 51 a d 5.2 also facilitate setting of the'collars 51 and 52, andenable the accuracy of such setting to be chccked pon the scales 10121111 2- .I also eonte p ate a a modificatio o my appar semploying a pairofcollars with scales marked ereon similar to the collars 8 and 9 o Fig,12, to berused detachably and inter-H changeably with a pair of recessedcollars 51 nd 2 as shown in F igsand i hene er he niunber of duplicatework members, required s relatively mal The operation, employingimproved Having prepared a master pattern or work member, a

pair of stop collars 5l and 52 with stop recesses calculated or measuredin the lathe from the master pattern are prepared, and a so a l ngiudinal stop bar w h opnotehes 74 or 7 5 an 76 cal ula ed or m as re omthemas er p tte n is prepared and moun ed upon the bar 68; commencingfor instance at one end of the work member, the pawl 37, for instance,is adjusted to active position and the pawl 36 adjusted to inactiveposition. The

': tool 27 is adjusted by means of the hand lever 60 toward the workcenter until the pawl tooth 56 enters a predetermined stop recess 53 ofthe collar 51, whereupon the longitudinal feed of the tool carriageeither by hand or by power is carried out until practically all of thespace of uniform diameter has been covered, after which the longitudinalv feed is stopped slightly short of theactual or respective shoulderswhich divide the work member into sections. In order to effect thefinish cuts of theseshoulders, the cross-feed carriage is adjusted tobring the tool 29 into position ready to operate upon-the work,

then the tool carriage is fed manually longitudinally until the tooth 87enters one of the stop recesses of the stop bars 74, 7 5' or 76 as thecase may be, so as to cause the tooth tool carriage rigidly to the lathebed.

87 when ressed or held down to stop or limit the longitudinal feed ofthe tool carriage, which brings'the tool accurately into position tomake a finish cut across one of the shoulders on the work member. Thebolt 20 and nut 21 are'then employed to clamp the The tool 29 is thenfed by the Cross-feed screw to face the first shoulder. The nut 21 isreleased and the tooth 87 is then released, and

the tool carriage fed longitudinally to a posi tion where the latchtooth 87 engages the next stop notch of the bar 74, 75, or 76, whichbrings the tool into accurate position to face the next shoulder of thework, and so on until all of the work shoulders have been finished. Ateach shoulder the tool carriage is clamped by the bolt 20 and nut 21 tothe lathebed, while the cross-feed screw is employed to feed the tool.across the face of the shoulder to be faced with a finish out until therotation of the cross-feed screw brings the pawl tooth 55 intoengagement with an appropriate stop recess 54 of the stop collar 52. Ifdesired a finish longitudinal out may be taken at the same time that theshoulder is faced, and as a continuation of the same cut, and this wouldbring the latch tooth 87 into position to engage the next longitudinalstop recess of the stop bar and position the tool carriage ready to facethe next work shoulder. The respective cross-feed and longitudinal stopmembers may be employed in various orders and combinations dependingupon the type of work required to be duplicated in quantity,

The tooth 87 may be temporarily held down in engagement with its stopnotch by a weight on lever 80, or by a suitable latch member as shown inFigs. 7, 9, or 13.

In the modifications shown in Fig. 13, and also in Fig. 9 the shaft 91is provided with a crank arm 126 which has a cam slot 127. The arm 126enters a recess 129 in the lower face of the latch bar 80, and the camslot 127 is engaged by a pm 128 carried by the latch bar 80. andspanning the recess 129. This modification serves to positively feed thelatch bar 80 through the rock shaft 91 in either direction up or,down.

The apparatusherein shown and described is capable ofconsiderablemodification within the scope of the spirit of my invention.

What I claim is:

1. A stop mechanism for machine tools.

comprising in combination with a machine tool, a main tool carriage, across feed tool carriage, stop mechanism to repeatedly stop, thecross-feed tool carriage at predetermined positions relative to the maincarriage, a stop bar supporting and carrying member mounted upon andmovable with th main tool carriage relative to the machine tool, aplurality of stop bars respectively detachably, mounted upon saidsupporting and carrying member and movable endwise with said main toolcarriage, said respective stop bars being provided with a plurality ofstop faces faced in one direction, a

stop engaging member mounted in fixedposition relative to said machinetool, and in positionto normally engage the stop faces of one 1 of saidstop bars and adjustable selectively into the path of the stop faces ofthe opposite stop bar, and means operable to successively shift one ofsaid interengaging stop members out of the path of the opposite stopmember,

2. A stop mechanism for machine tools comprising in combination with amachine tool, a main tool carriage mounted-thereon to movelongitudinally, a cross-feed tool car- 'riage mounted to movetransversely upon.

said main tool. carriage, a cross-feed screw adapted to feed saidcross-feed tool carriage relative to said main tool carriage, aplurality of stop members mounted upon the forward end of said crossfeed screw and rotatable with said crossfeed screw, one of saidrotatable stop, members being provided with a plurality of stop facesfaced in one direction and the other of saidrotatable stop members beingprovidedwith a plurality of stop faces faced in the opposite direction,and a plurali-- ty of stop engaging members mounted upon one of saidtool carriage carriages and respectively movable into and out of thepath of movement of stop faces of said respective rotative stop membersto stop the cross-feed of said cross-feed tool repeatedly in eitherdirection at predetermined positions thereof relative to said main toolcarriage, means op- V erable to normally hold said non-rotatable stopengaging members in position to engage said rotatable stop members,andmeans to selectively adjust said non-rotatable stop path of members toidle position out'of the said rotatable stop members. V I 3. A stopmechanism for machine tools comprising in combination with a machine 7tool, a mam tool carnage mounted thereon to gaging member mounted uponone of said tool carriages and movable radially of said stop collar intoand out of engagement With successive stop faces of said stop collar tore peatedly stop said cross feed tool carrlage at vpredeterminedpositions relative to said main tool carriage.

4. A stop mechanism for machine tools comprising in combination with amachine tool, a main tool carriage mounted thereon to movelongitudinally, a cross feed tool carriage mounted to move transverselyupon said main tool carriage, a cross-feed screw adapted to feed saidcross feed tool carriage relative to said main tool carriage, a pair ofcollars mounted upon said cross feed screw to rotate therewith, one ofsaid collars being provided with a plurality of stop faces faced 7 saidrespective stop collars to repeatedly stop said cross feed tool carriageat predetermined positions relative to said main tool carriage.

5. A stop mechanism for machine tools comprlslng 1n comblnatlon withamachine tool, a main tool carriage mounted thereon to movelongitudinally, a cross-feed tool carriage mounted to move transverselyupon said main tool carriage, a cross-feed screw adapted to feed saidcross feed tool carriage relative to the main tool carriage, a stopmember mounted upon the forwardend of said cross-feed screw androtatable with said cross-feed screw, said stop member being pro videdwith a plurality ofstop faces faced in one directioma stop engagingmember mounted: upon onev of said tool carriagesin position tointerengage successively with said rotatable stop faces 'of saidrotatable stop member and permits-aid stop faces to pass said stopengaging member when. saidstop engaging member is moved out of thepathof said. rotatable stop faces, and stop mechanism operable, inconnection with said cross-feed v stop mechanismto stop said maintoolcarriage' at a plurality ofpredeterminedposi tions. along the waysin position for successive stops on said rotatable stop members. to'ibeengaged by said stop engaging member. 7 1 i 6. Astop mechanism formachine tools 1 comprising in combination with a 'machine tool, a maintool carr age mounted thereon to move longitudinally, a cross-feed toolcar riage mounted to move transversely upon said main tool carriage, across-feed. screw adapted to feed said cross feed tool carriage relativeto'the main tool carriage,a stopmem ber mounted upon the forward end ofsaid cross-feed screw and rotatable with. ,said cros -feed screw, saidstop member being ro vided with a plurality of stop faces faced in onedirection, a stop engaging member mounted upon. one ofsaid toolcarrlagesin position to interengage successively with said rotatablestop faces of saidrotatable stop member and permitsaid stop faces topass saidstop engaging member when said sto'p nism operable inconnection withsaid crossfeed stop mechanism to stop said mainv toolcarriage at a plurality of predetermined positions along the ways inposition for success'ive stops on said rotatable stop members to be en aedb said sto en a 'n member. in one direction'and located at theperiphery g g y p g g1 g 7. A stop mechanism for machine toolsengaging'member is moved out of the path 1 of said rotatable stop faces,and stop mecha comprising in combination with a machine tool a main toolcarriage mounted thereon to move longitudinally, a cross feed tool car rage mounted to move transversely upon said main tool carriage, a crossfeed screw adapted to feed said cross feed tool carriage relative tosaid main tool carriage, a sleeve a in which sald cross feed screw isournaled and held against movement endwise thereof adapted to bestationarily mounted upon'said cross feed carriage, a collar mountedupon said cross feeclscrew outside of said sleeve and provided with aplurality of stop faces i all faced in one direction and adapted to besuccessively employed to stop the cross feed of said cross feed carriageat different positions of the main tool carriage longitudinally ize 7 ofthe machine tool, a stop member mounted a upon said collar andridingupon the periphery of said stop collar and movable radially 1:25 r ofsaid stop collar to successively stop the i cross feed atdilferentpositions of the tool 7 carriages longitudinally of the machine tool.

8. stop mechanism for machine .tools comprlslng incombinationwithagmachine tool a main tool carriage mounted thereon to movelongitudinally, a cross feed tool carriage mounted to move transverselyupon said maintool carriage, a cross feed screw adapted to feed saidcross feed tool carriage relative to saidmain tool carriage, a sleeve inwhich said cross feed screw is journaled and held against movementendwise thereof adapted to be stationarily mounted upon said cross feedcarriage, a collar mounted upon said cross feed screw outside of saidsleeve and provided with a plurality of stop faces all faced in onedirection and adapted to be successively employed to stop the cross feedof said cross feed carriage at different positions of the main toolcarriage longitudinally of the machine tool, a stop member mounted uponsaid sleeve and riding upon the periphery of said stop collar andmovableradially of said stop collar to successively stop the cross feedat different positions of the tool carriage longitudinally of themachine tool, a second collar mounted upon said cross feed screw outsideof said sleeve and provided with a plurality of stop faces all faced inone direction and in the opposite direction to that of the stops of saidfirst collar, a second stop member mounted upon said sleeve and ridingupon the periphery of said second stop collar and movable radially ofsaid stop collar to suecessively stop the cross feed at a differentseries of positions of the tool carriage longitudinally of the machinetool.

In testimony whereof I have aflixed my signature.

WILLIAM SCHRODER.

